/**
 * Grid containing 1 or 0 denoting which solution values should be displayed to user
 * @author W Wang
 */
public class MaskGrid extends Grid{
	private Grid maskGrid;
	
	public MaskGrid(int difficulty) {
		initialise(difficulty);
	}
	
	public Grid initialise(int difficulty) {
		//stuff
		maskGrid = new Grid();
		//do more stuff, fill with 1s and 0s
		return maskGrid;
	}
}